Hardening of cast-iron and the like.



"UNITED; STATES PATENT oEEIoE.

HELEN. EMETT,- OF NEW WESTMINSTER, BRITISH-COLUMBIA, CANADA,ADMINIsTEATRIX OF GEORGE HENRY HAWKINS EMETT, DECEASED. t

HAR ENmeoF CAST-IRON AND THE LIKE.

No. 878,053. x

' To cli it may concern:

Be it known that GE'oRGE' HENRY HAw-.

' KINS EM TT,- late a subject of the King of.

' dening theresulting metal, the degree of hardness being dependent uponthe,pr0 tionsadopted. 1 Y

castings for rock 'crushers, stamp mills,

sheavesforwire ropes, and the like-articles, where a hard-metal isrequired; the resulting metal can be made so hard and tough that it willwithstand the action upon it ofthe hardest steel, and it can be made ofuniform hardness throughout, or, if required, only the I desired partofthe casting may be hardened,

the rest being left comparatively soft.'

According to this invention" a compound prepared according to thefollowing formula sulfur '8 pounds,dryred,lead 1 pound, lamp 15 made,and. it is added to and Well mixed with the molten metal in thedifferent r0- portions hereinafter given to suit the di erentrequirements. a

The compound consists of:' Flowers of black 4 ounces. These. ingredientsare ground in a mill, then run through asieve, and Well mixed together.

Specification of Iietters Patent. Aiiplication filedfebruary 17. 1906-Serial No. 301.679.

The invention is particularly applicable to I The following ives'theproportion of comound and metfi for typical cases, and may e taken as aguide inselecting the propertions for any given purpose :For generalpurposes, 1 lb. of the compound is added to 30 lbs. of molten" iron; forrock crusher castings (chilled), 1 lb. of coin oundto 40 lbs. of iron;for sheaves (not. pound to 25 lbs. of Iron; and for sheaves with softcore, 1 lb. of compound to. 30 lbs. of iron.

The proportions given both for -the com position of. the compound,and-for the pro- Patented Feb. 4, 1908.

ed) 1 lb. of comportions of the latter to-the iron, for the dif- Iferent purposes, are of. course approximate; these may be varied andequivalent substances substituted for those mentioned within the limitsof the invention.

I claim as the invention of GEORGE HENRY HAWKINS EMETT the following: t

L The hereindescribed compound for hardening iron, consistinof'fi'o'wers ofsulfur, red'lead and lam blaci a 2. The herein escribedcompound for hardenin'g iron consisting of flowers of sulfur, dry redlead and lamp. black in "substantially the proportions of 8 pounds ofsulf'ur,1 pound of lead and 4 ouncesof lamp black.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses. H

Q HELEN EMETT, Administmmmof the estate ofGeorge Henry HawkinsEmett,deeeased. Witnesses: JOSEPH ROWAN GRANT, GoRDoN EDWARD CoEBoULD.

